Cylinder-lapping tool



et M 159240 E. s. KARSTENS CYLINDER LAPPING TOOL Filed Sept. 25

ATTORNEY lll Patented oct. 14, 1924.v

UNITED STATES EDWARD S. KARSTENS, O'F DAVENPORT, OWA..

CYLINDERFLAPPING TOOL.

Application filed September 25, 1922. Serial No. 590,490.`

To all whom t 'may concern.'

Be it known that EDWARD S. KARSTENS, a citizen of the United States,residing at Davenport, in the county of Scott and State of iowa, hasinvented certain new and useful Improvements 1n Cylinder-Lapping Tools,of which the following is a specification.

My invention relates to improvements in appliances for lapping incylinders of internal combustion engines and similar nuses and may alsobe used for grinding such cylinders.

The objects of my invention are, first, to provide a cylinder lappingtool which can be utilized for grinding E -head and T-head motors with ahead cast integral with the cylinder block; second, to provide acylinder lapping tool for grinding valve-inhead cylinders where there.is a very small clearance at the head end of the cylinder; third, toprovide means by which Ithe blocks of abrasive material in the lappingtool are firmly held and to control the feed of such blocks and maintainthe blocks parallel to the longitudinal axis of the body ofthe lappingtool and Ito provide for a` graduatedfeed of such blocks.

I attain these objects by the mechanism illustrated in the accompanyingdrawings, in \\'hioh,-

Figure 1 represents a side elevation of my lapping appliance showing theupper half thereof in section on the middle line; Fig. 2 is a plan viewof one of the stoneholders: Fig. S is a side elevation of one of thestoneholders; Fig. 4 is an end elevation thereof; Fig. 5 is alongitudinal section of the adjusting screw; Fig. 6 is an end view ofthe adjusting screw; Fig. 7 is an end view of the larger end of the bodyof the tool with the stoneholders and inner collar removed; Fig. 8 is anend view of the inner collar and front end of the appliance; Fig. 9 is aside elevation of the inner collar showing the bevelled face in dottedlines; Fig. 10 shows a side velevation of the rear or exterior collarwith the inner lines thereof shown in dotted lines; Fig. 11 is an innerend View of the external collar; Fig. 12 is a plan View and Figure 13 isa longitudinal section of the spring.

l( refer to the right end of Figure 1 as the front end of the applianceand the left end of Figure 1 as the rear end of the appliance. i

Similar numerals refer Ito similar parts tl'iroughout the several views.

The body of my device comprises a tapered shank, la, with a bodyportion, 1, formed integral therewith.

The body is cylindrical, but has a plurality of longitudinal channels,5, cut or otherwise formed in it. The front end of 'the body is bevelledor tapered to correspond to the internal bevel or t-aper of the frontcollar, 6, which is a circular collar surrounding the shank and smallerend of the body of the appliance and may be secured inplace by setscrews as shown in Figure or otherwise. i

Stoneholders, 2, corresponding inwidth and length to the channels, 5,are seated in said channels. The rear end of each stoneholder, 2, isshaped to correspond with the internal taper of the collar, 6. rlhe rearend of each stoneholder has an outwardly projecting portioncorresponding in height to the outwardly projecting portion at the frontend and the internal faces of these projecting portions are bevelled toenable fthem to retain the grinding or lapping stones, A3. rlhe frontend of each stoneholder also has an inwardly projecting portion, 12,formed integral therewith, although slightly narrower than the outerportion and the inwardly projecting portion, 12, has its inner facebevelled or tapered to correspond to the bevel or taper, of the face,11, ofthe rear end of the stoneholdeny but with this difference, thatthe face of the rear end, l1, is curved laterally to lit the internaltaper of the collar, 6, while the bevelled face of the projectingportion, 12, is preferably made fiat to fit a correspondingfiat-loottomed channel, 15, in the side of the internal collar, 14.

The channel, 5a, is formed in the inwardly projecting portion, 12, ofthe front end of each stoneholder adapted to receive a head, 9. of anadjusting screw, 7.

The adjusting screw, 7, is threaded to Et into a threaded centralopening in the body, 1, and the threaded screw, 7, is preferably formedwith a hexagonal key Seat. formed in the head end thereof adapted toreceive 'a ke by which the screw, 7, can turned.

As t e screw, 7, is turned, the head, e, not

body when the screw is turned in one direction and when turned in theopposlte d1- f rection, the stoneholders are pressed outwardly by thefiat springs, et, one of which is mounted in each channel, 5, of thebody of the tool. A pin, 17, is secured in a closely fitting hole oropening in the middle of each stoneholder adapted to enter acorresponding opening, 18, in the middle of the adjacent sprlng, 4. Ihave shown a flat spring in the drawings as my preferred form, havingits ends bearing against the stoneholder near the ends thereof and itsmiddle portion bearing against the bottom of its corresponding channel,5, but it is obvious that other forms of springs maybe used toeiiectthesame purposes.

The front end of the body, 1, is provided with a circular opening largeenough to receive the collar, 414, and a small space is left between thethreaded screw, 7, and the surrounding portions of the inwardlyextending ends of the stoneholders, 2.

lIn a lapping appliance adapted to grind or lap cylinders ofapproximately three inches in diameter, I prefer to provide sufficientspace ttor inward and outward movement of the stoneholders ofapproximately three-eighths of an inch, but this space may be varied tosuit the requirements of each particular case and to meet requirementsfor different sized cylinders, it being preferable to have a number oflapping tools to correspond to different standard sizes of cylindersrather 'than to allow too large a limit of adjustment for eachparticular tool.

In the operation of my device, the shank, 1a is mounted in the toolholder of an engine lathe, boring mill or other suitable machine. Thecylinder to be lapped or Aground is then adjusted to the desireddiameter and the work proceeded with in the ordinary way.

The lapping stones may be varied in granular structure to meet therequirements ot each particular case. Where a large amount of materialis to be taken out, it is preterable to use coarser stones for the firstcut or two and it desired, stones may be used ot such a tine grain as tomerely true up and polish the interior of the cylinders withouteffecting any material cutting away of stock.

It is obvious that my device may be used for either wet or dry grinding,but for many classes of work, I prefer to use oil as it will procure asmoother cut and finish than could otherwise be obtained. Y

In practice, I prefer 'to secure the stones in place in the stoneholdersby leading them in, butit is obvious that they may be secured in placeby any other suitable means.

The size and proportions of my appliance may be varied to meet therequirements of each particular case without departing from the spiritof my invention. In the case of large cylinders, where there" issuilicient room, the number of channels and stoneholders may beincreased and in smaller sized cylinders, it may be reduced to three ortwo if desired. The collar, 14, may be formed integral with the body, 1,but is easier to manufacture if formed separately.

I claim: V

1. In a lapping tool al cylindrical body having a shank at one endformed integral therewith, an internally tapered collar secured to thebody adjacent the shank, aA

cylindrical seat formed in the opposite end of the body and a collarseated therein tapered internally at an angle to correspond to theinternal taper of the collar adjacent the shank and stoneholders having'extensions engaging the collars with tapers corresponding to the taperof the collars.

2. In a lapping -tool a. cylindrical body having a shank at one end'formed integral therewith, an internally tapered collar secured to thebody adjacent the shank, a cylindrical seat formed in the opposite endof the body and a collar seated` therein tapered internally at an angleto correspond to the internal taper of the collar adjacent the shankand, stoneholders having extensions engaging the collars withtaperscorresponding to the taper of the collars, said stoneholders beingsecured in longitudinal channels formed in the body 'of the appliance.

3. In a lapping tool a cylindrical body having a shank at the end formedintegral therewith, an internally tapered collar secured to the bodyadjacent the shank. a cylindrical seat formed in the opposite end of thebody land a collar seated therein tapered internally at an angle tocorrespond to the internal taper of the collar adjacent the shank,stoneholders having extensions engaging the collars with tapers.correspending to the taper of the collars, an adjusting screw threadedinto a longitudinal opening in the center of the body and means tortransmitting the longitudinal motion ot thc adjusting screw to thestoneholders.

4. In a lapping tool a cylindrical body having a shank at one end formedintegral therewith, an internally tapered collar secured to the bodyadjacent the shank, a cylindrical seat formed in the o posite end oi'the body and a collar seated therein tapered internally at an angle tocorrespond to the internal taper of the collar adjacent the shank,stoneholders having 'extensions engaging the collars with taperscorresponding to the taper of the collars and an adjusting reinseriscrewthreaded into a longitudinal opening in the body of the appliance andhaving a head projecting into the grooves or channels formed in inwardlyprojecting portions of the stoneliolders.

5. ln a lapping tool a cylindrical ybodyv having a shank at one endformed integral therewith, aninternally tapered collar secured to thebody adjacent the shank, a cylindrical seat formed inthe opposite end ofthe body and a collar seated therein tapered internally at an angle tocorrespond to the internal taper of the collar adjacent the shank,stoneholders having extensions en-.'

gaging the collars with tapers corresponding to the taper of thecollars, said stoneholders being secured in longitudinal channels formedin the body of the appliance and a spring seated in the bottom ot' eachchannel with its ends bearing against the holder and ijtsv intermediateportion bearing against the ody.

6. ln a lapping tool, a cylindrical body having arshank at one endformed integral therewith, an internally tapered collar secured to thebody adjacent the shank, a cylindrical seat formed in the opposite endof' the body and a collar seated therein tapered internally at an angleto correspond to the internal taper of the collar adjacent the shank,stoneholders having extensions engaging the collars with taperscorresponding to the taper of the collars, said stoneholders beingsecured in longitudinal channels formed in the body of the appliance, anadjusting screw threaded into a longitudinal opening in the center ofthe body, means for transmitting the longitudinal motion of theadjusting screw to the stoneholders, and a spring seated in the bottomof each channel with its ends bearing against the holder and itsintermediate portion bearing against the body. 7. In a tool for lappingand grinding cylinders, the combination with a plurality of abrasiveblocks mounted in suitable holders, of projecting ends formed upon saidholders carrying similarly taperedv portions, said holders being securedin longitudinal channels formed in the body of the appliance, collarssecured at each end of the body having internally tapered facescorresponding to the tapered portions of the holders, an adjusting screwthreaded into a longitudinal opening in the'body of the appliance andmeans operatively connecting the adjusting screw with the holders.

8. ln a tool for lapping and grinding cylinders, the combination with aplurality of abrasive blocks mounted in suitable holders,

of projecting ends formed upon said holders vnels formed in the body ofthe appliance.,

collars secured at each end of the body ot the appliance havinginternally tapered Vfaces corresponding to the tapered portions of theholders, an adjusting screw threaded into a longitudinal opening in thebody of the appliance, means operatively connecting the adjusting screwwith the holders, a spring seated in the bottoni of each channel withits ends bearing against the adjacent holder and its intermediateportion bearing against the body, and a pin or lug securing each springto its adjacent holder.

9. ln a tool for lapping cylinders. the combination with a plurality ofstoneholders, each stoneholder having one end tapered longitudinally andits opposite end provided with an inward extension carrying a similarlytapered portion, ot collars secured to the body of the tool and havinginternally tapered faces corresponding to the tapered portions of thestoneholders, means for adjusting the position of the stoneholderslongitudinally upon the tapered faces ot the collars4 and a plurality ofsprings mounted upon the body of the tool bearing outwardly against thestoneholders respectively.

10.` ln a cylinder lapping and grinding appliance, the combination witha body having an internally tapered seat formed therein and aninternally tapered collar portion secured thereto, of stoneholderscarryin projecting portions tapered to correspon with the tapers of theseat and collar and adapted to engage the seat and collar rej EDWARD S.KARSTENS.

